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China Marine Butterfly Valve Semi-Lug Type JIS 5K/10K - Reliable Suppliers from Factory

Marine butterfly valves are essential control components in marine pipeline systems, recognized for their compact structure and lightweight design. As a leading product from China, these valves offer fast opening and closing speeds, low flow resistance, and impressive corrosion resistance. Adaptable to various media, including seawater, freshwater, fuel oil, and sewage, they are pivotal in critical marine piping applications. Our factory produces these valves to meet the demands of modern shipbuilding, making them the preferred choice among suppliers in the industry. Experience the reliability and efficiency of marine butterfly valves for your maritime needs

Product Details

Technical Specifications & Pressure Test

Pressure test		5K	10K
Shell		7.5bar	15bar
Seal	Water	5.5bar	11bar
	Air	6bar	6bar
Working Temperature		-20~120℃

Material List

No.	Part Name	Materials
1	Body	DI
2	Bottom shaft	SS410
3	Disc	CF8
4	Upper shaft	SS410
5	Seat	EPDM
6	Bushing	Polymer
7	O ring	EPDM
8	Wormgear	DI

Dimensions Data (mm)

DN	L	A	B	ΦE	ΦF	n-Φd1	5K			10K
DN	L	A	B	ΦE	ΦF	n-Φd1	ØD	ØD1	n-Ød	ΦD	ΦD1	N-Φd
50	43	130	83	65	50	4-Φ8	130	105	4-15	155	120	4-19
65	46	140	93	65	50	4-Φ8	155	130	4-15	175	140	4-19
80	46	149	100	65	50	4-Φ8	180	145	4-19	185	150	8-19
100	52	156	110	90	70	4-Φ10	200	165	8-19	210	175	8-19
125	56	177	125	90	70	4-Φ10	235	200	8-19	250	210	8-23
150	56	200	143	90	70	4-Φ10	265	230	8-19	280	240	8-23
200	60	225	170	125	102	4-Φ12	320	280	8-23	330	290	12-23
250	68	280	203	125	102	4-Φ12	385	345	12-23	400	355	12-25
300	78	309	230	125	102	4-Φ12	430	390	12-23	445	400	16-25
350	78	325	260	125	102	4-Φ12	480	435	12-25	490	445	16-25
400	102	371	290	175	140	4-Φ18	540	495	16-25	560	510	16-27
450	114	392	330	175	140	4-Φ18	605	555	16-25	620	565	20-27
500	127	431	358	175	140	4-Φ18	655	605	20-25	675	620	20-27
600	154	505	435	210	165	4-Φ22	770	715	20-27	795	730	24-33

Typical Marine Application Scenarios

1. Ballast Water System

As one of the most widely applied scenarios, the ballast water system transports sediment-laden seawater under normal temperature and low pressure. Concentric wafer-type soft seal butterfly valves with EPDM seals and 316L stainless steel or ductile iron valve bodies are primarily adopted to balance cost, corrosion resistance and sealing performance. Large-diameter main pipelines are equipped with double eccentric butterfly valves for enhanced stability.

2. Seawater & Fresh Water Cooling

Affected by strong seawater corrosion and medium pressure, this system mainly uses double eccentric soft seal butterfly valves with aluminum bronze or 316L stainless steel valve bodies to ensure long-term stable heat exchange and cooling efficiency.

3. Bilge and Sewage System

Facing media containing oil stains and impurities, the system adopts concentric soft seal butterfly valves with oil-resistant NBR/EPDM seals, featuring good anti-fouling performance and convenient daily maintenance.

4. Marine Fire-fighting System

Requiring rapid emergency switching and reliable tightness, flange-type soft seal butterfly valves with epoxy-coated ductile iron are applied to resist pipeline vibration and ensure safe and efficient water supply in emergency situations.

5. Fuel & Lubricating Oil System

For flammable and explosive oil media, double eccentric metal hard seal or FKM soft seal butterfly valves are selected to meet fireproof, high-temperature resistant and safe cut-off requirements.

6. Ventilation & HVAC System

Lightweight concentric wafer-type butterfly valves are widely used for air volume regulation and pipeline isolation, thanks to their low flow resistance and space-saving installation advantages.

7. Special Extreme Conditions

Triple eccentric metal hard seal butterfly valves are applied to high-temperature flue gas and desulfurization systems, while food-grade sanitary butterfly valves are used for ship domestic fresh water systems to meet hygiene standards.

Frequently Asked Questions

Q: What is the working temperature range for these butterfly valves?

The standard working temperature range for the valves is between -20℃ and 120℃, making them suitable for various marine environments.

Q: Which materials are commonly used for the valve body?

Common materials include Ductile Iron (DI), 316L stainless steel, and aluminum bronze, chosen based on specific system requirements like corrosion resistance and cost.

Q: What type of valve is recommended for ballast water systems?

Concentric wafer-type soft seal butterfly valves with EPDM seals are typically used. For large-diameter main pipelines, double eccentric butterfly valves are preferred for enhanced stability.

Q: What are the pressure test standards for the 10K specification?

For the 10K specification, the shell is tested at a pressure of 15 bar, the water seal at 11 bar, and the air seal at 6 bar.

Q: How do the valves perform in marine fire-fighting systems?

Flange-type soft seal butterfly valves with epoxy-coated ductile iron are used in fire-fighting systems to effectively resist pipeline vibration and ensure rapid, reliable tightness during emergencies.

Q: Are there specific valves for food-grade or domestic fresh water applications?

Yes, food-grade sanitary butterfly valves are specifically utilized for ship domestic fresh water systems to meet strict hygiene and safety standards.